Worksheet 6 · Skill 5

Set and drift

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1. At 1405 your fix is 015°T, 2.8 nm from Mill stack. You steer 301°T at 6.0 kn through the water. At 1500 a new fix puts you 006°T, 1.5 nm from Westfield church spire.

   Plot the 1500 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0815 your fix is 263°T, 3.5 nm from Tern Island tower. You steer 305°T at 5.8 kn through the water. At 0855 a new fix puts you 016°T, 2.1 nm from Westfield church spire.

   Plot the 0855 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1245 your fix is 050°T, 2.5 nm from Gannet Rock daybeacon. You steer 264°T at 4.5 kn through the water. At 1315 a new fix puts you 132°T, 1.3 nm from Tern Island tower.

   Plot the 1315 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1000 your fix is 061°T, 2.8 nm from Westfield church spire. You steer 098°T at 4.4 kn through the water. At 1040 a new fix puts you 267°T, 3.2 nm from Tern Island tower.

   Plot the 1040 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1410 your fix is 342°T, 2.5 nm from Mill stack. You steer 351°T at 4.3 kn through the water. At 1445 a new fix puts you 057°T, 3.1 nm from Heron Point Light.

   Plot the 1445 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0955 your fix is 101°T, 2.0 nm from Tern Island tower. You steer 235°T at 4.0 kn through the water. At 1110 a new fix puts you 301°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1110 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1500 your fix is 057°T, 3.4 nm from Heron Point Light. You steer 072°T at 4.6 kn through the water. At 1530 a new fix puts you 287°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1530 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0840 your fix is 353°T, 1.6 nm from Heron Point Light. You steer 006°T at 4.3 kn through the water. At 0920 a new fix puts you 275°T, 3.8 nm from Tern Island tower.

   Plot the 0920 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn